1028865 has 16 divisors (see below), whose sum is σ = 1663488. Its totient is φ = 542976.

The previous prime is 1028843. The next prime is 1028873. The reversal of 1028865 is 5688201.

1028865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1028865 - 2⁷ = 1028737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1392 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (103968).

2^1028865 is an apocalyptic number.

1028865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1028865 is a deficient number, since it is larger than the sum of its proper divisors (634623).

1028865 is a wasteful number, since it uses less digits than its factorization.

1028865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1028865 is about 1014.3298280145. The cubic root of 1028865 is about 100.9530546787.

Adding to 1028865 its sum of digits (30), we get a triangular number (1028895 = T₁₄₃₄).

The spelling of 1028865 in words is "one million, twenty-eight thousand, eight hundred sixty-five".